Compound grinder and pulverizer



' S. H. HERBST, JR.

COMPOUND GRINDER AND PULVERIZER.

APPLICATION FILED MAR. 9, I920.

1 ,35 8,739. Patented Nov. 16, 1920.

3 SHEETS-SHEET I.

WITNESSES INVENTOR S. HLHerbst Jr.

S; H. HERBST, 1R.

COMPOUND GRINDER AND PULVERIZER.

APPLICATION FILED MAR. 9, 1920.

1,358,789. Patented Nov. 16, 1920.

3 SHEETS-SHEET 2.

xghM/wt r 9 SH. Herbsf Jr. Q 7 I 0% g A TTORNEYS 10 11 INVENTUR S. H. HEHBST, JR.

COMPOUND GRINDER AND PULVERIZER.

3 SHEETSMHEET 3.

APPLICATION FILED MARQ, 1920.

l mmm Nave EVE WITNESSES r? WORM? V3 UNITED STATES SAMUEL H. HERIBST, JR... OF FULLERTON, PENNSYLVANIA.

COMPOUND GRINDER AND PULVERIZER.

Application filed March 9, 1920.

To a]? whom it may concern Be it known that I. SAMUEL H. Hnnnsr, Jr.. a citizen of the United States, and a resident of Fullerton. in the county of Lehigh and State of Pennsylvania, have invented certain new and useful Improvemets in Compound Grinders and Pulverizers. of which the following is a specification.

My invention is an improvement in compound grinders and pulveriylers, and has for its object to provide a machine of the character specified designed to crush and pulverize material of every character, as. for instance, coal, rock, clinker, coke, ore, ce ment and the like, wherein the material is compound ground and delivered. a finished product, ready for the market.

In the drawings:

Figure 1 is a side view of machine F ig. 2 is a top plan view;

Fig. 3 is a vertical section;

Fig. 4 is a horizontal section at the rolls; Figs. 5 and (3 are sections on the lines and (S6, respectively, of Fig. 3.

In the present embodiment of the invention a suitable casing is provided. consisting of a base 1 which, as shown more especially in Fig. 2, has an internal annular the improved channel 2. and neon this base there is seated a body portion 3. the said body portion being of frusto-conical form and being sectional, as shown in Fig. 1.

A cover plate 4: is seated on the top of the body 3 of the casing, and the body is secured to the base and to the cover, and the sections of the body are secured together by means of bolts and nuts 5 which pass through flanges on the body and base and through the cover. That portion 6 of the base which is within the trough 2 is of considerable thickness, as shown. and is provided with discharge openings 7.

A grinding ring 8 encircles this portion 6, the said portion 6 being annularly rabbeted externally, while the grinding ring is annularly rabbeted internally, to form cooperating shoulders 9 for engagement to limit the downward movement of the ring, as clearly shown in Fig. 3., This ring 6 is the inner grinding ring and an outer grinding ring 10 is seated on the base at the periphery thereof, the said ring and base having cooperating shoulders 11 similar to the shoulders 8 for limiting the downward move- Specification of Letters Patent.

Patented Nov. 16, 1920.

Serial No. 364.487.

ment of the outer ring. Referring to Fi :3. it will be seen that the abutting faces 8f the rings and the base are recessed 21111111- larly. the recesses cooperating to form an annular chamber between each'ring and the base.

A disk 12 is held in the casing. inst below the cover 4. by means to be presently described. and this disk carries a series of depending arms 13. The disk also carries pairs of radial webs 1-1. the members of each pair being arranged on opposite sides of a depending arm 13. and between each pair of webs there is provided a bearing sleeve 15.

Each sleeve is supported by a pivot pin 16 which is passed through the webs and through an opening in the bearing sleeve. the arrangement being such that the lower end of the bearing sleeve may swing radially with respect to the disk and to the axis of the casing.

Referring to Figs. 3 and 4:. it will be seen that these bearing sleeves are in two series.

the alternate sleeves being nearer the cen ter than the intermediate sleeves. The webs 13 are on the inner side of the bearing sleeves which are more remote from the center. and on the outer side of the sleeves which are nearer the center.

A shaft 17 is journaled in each bearing sleeve, and it will be noticed that the upper end of the bore of each sleeve tapers as does also the upper end of the shaft, and each shaft is held in the bearing sleeve by a nut 18 which is threaded on to the upper end of the shaft. Each shaft 17 has a head 18 at its lower end and a grinding roller 19 is held on each shaft at its lower end.

A hub 20 is journaled on each shaft below the lower'end of the bearing sleeve, and a bushing 21 is arranged between each hub and the sleeve. It will be noticed. referring to Fig. 3, that each hub has a marginal flange 22 above the grinding wheel which abuts the upper end thereof, and bolts 23 connect the grinding wheel or roller with the flange. The bushing 21 is arranged between the hub and the shaft. the hub abutarm 13 and the adjacent bearing sleeve, the

arm, and the tension of each spring may be adjusted by means of beaded pins 26 which are passed through the arm and engaged by lock nuts on the opposite side of the arm from the bearing sleeve. The springs of that series of bearing sleeves which are remote from the center of the casing are on the inner sides of the bearing sleeves, while in that series of sleeves which are near the center the springs are on the outer sides. The grinding wheels of the shafts 17 remote from the center of the casing cooperate with the grinding ring 10, while the grinding wheels of those shafts 17 near the center cotip'erate with the ring 8.

An annular frusto-conical or tapering screen 27 is arrangedoutside of the grinding wheels, near thecasing body, and in spaced relation and parallel therewith, the lower edge of the screen being seated on the base, while "the upper edge is spaced from the body ofthe casing by a ring 27*. The base has openings 28 at the annular chamber formed between the screen and the body of the casing to permit the passage of the ground material from the casing.

A second screen 29 of annular formation is arranged at the inner side of the'trough 2, being held by a support 30 which, as shown, consists of a conical roof and depending legs which are seated in that portion of the base within the trough, and these legs are within the screen. Through the screen 29 passes the material which is com pleted by the rollers cooperating with the inner ring 8. In order to pass the ground material to the screens 27 and 29, vanes or blades 31 and 32 are supported by the depending arms 13, a blade being arranged at the lower end of each arm, and these blades are radial to the casing.

The casing has feed openings 33 at'diametrically opposite points through which the material is fed, and hoppers 34 are provided at these points, as indicated in Figs. 1 and 2.

A spider is supported by the cover, the said spider consisting of a lower section 35 and an upper section 36 secured together by means of bolts and nuts 37, and a shaft 38 is journaled in central bearings 39 and 40 in-the spider sections, this shaft at its lower end being connected with the center 'ofthe disk 12.

The disk has a hub provided with a tapering bore, and a bushing 41 is arranged within the hub, between the reduced lower end of the shaft and the hub. A nut 42 is threaded on to the shaft below the hub, and this shaft, as clearly shown in Fig. 3,'is longitudinally cored or bored.

An oil reservoir 44 is supported at the the upper end of the shaft and the upper spider, and a bushing 46 is arranged between the lower end of the shaft and the lower spider. A pulley 47 is secured to the shaft between these bushings, and this pulley may be connected with a suitable source of power by means of abelt. The shaft has a collar 48 between the hub of the pulley 47 and the lower spider, and washers 49 are arranged below the collar. i p

I The operation of the improved machine is as follows:

The" material is fed to the casing by means of therhoppers 34 and, referring to Fig. 4, it will be seen that this material will fall between the outer grinding ring and the wheel of the series which is nearer the outer ring and which cooperates therewith. The material will be groundbetween this wheel I and the ring and will then be passed to the inner grinding ring, between the said ring and the wheel of the series which cooperates withthe ring. The material will be ground of sufiicient fineness after it passes between the second wheel and the inner grinding ring, and it will be. fed by that vane which is just in advance of the last named grinding wheel through the screen 29 and through the openings 7. i

That portionof the material which is of sufiicient fineness after leaving the first grinding wheel will be delivered by the vane which is at the first grinding wheel of the second seriesthrough the outer screen 27 and throughthe openings 28 will be delivered from the casing.

The material may be ground from ten mesh'to two hundred mesh and just as fine as woven mesh can be made. It leaves the mill a finished product, ready for the market and the improved mill can be operated at a high or low speed, because of the yielding mounting of the rollers or wheels,'which insures the easy contact with the grinding rings at all times. I

The outside grinding ring is twice the diameter of the inside ring so that the outer series of rollers or wheels makes twice as many revolutions as the rollers of the inner series do, thereby causing the material to be powdered much quicker. The spring mounting of the grinding rolls assures a uniform grinding factor and reduces wear, there being no hammering between the rings and rolls or wheels.

I claim:

'1. A machine of the character specified comprising a trough shaped base, inner and outer grinding rings supported by the base in spaced relation at the inner and outer edges of the trough, a rotating support above the base. bearing sleeves pivoted to the base to swing radially thereof, shafts journaled in the sleeves. grinding wheels supported by the shafts at their lower ends and cooperating with the rings, the alternate shafts being spaced inwardly to permit the grinding wheels to cooperate with the inner ring and the intermediate shafts being spaced outwardly to permit the grinding wheels to cooperate with the outer ring, and yielding means forcing each bearing sleeve toward the adjacent ring, means for rotating the support, a housing for the suppoit and shafts seated on the base and having feed openings, screens at the inner and outer edges of the trough through which the ground material is delivered, and vanes in connection with the support for feeding the ground material through the screens.

2. A machine of the character specified comprising a trough shaped base, inner and outer grinding rings supported by the base in spaced relation at the inner and outer edges of the trough, a rotating support above the base, bearing sleeves pivoted to the base to swing radially thereof, shafts journaled in the sleeves, grinding wheels supported by the shafts at their lower ends and cooperating with the rings, the alter" nate shafts being spaced inwardly to permit the grinding wheels to cooperate with the inner ring and the intermediate shafts being spaced outwardly to permit the grinding wheels to cooperate with the outer ring, and yielding means forcing each bearing sleeve toward the adjacent ring, means for rotating the support, a housing for the sup port and shafts seated on the base and having feed openings, and screens at the inner and outer edges of the trough through which the ground material is delivered.

3. A machine of the character specified comprising a trough shaped base, inner and outer grinding rings supported by the base in spaced relation at the inner and outer edges of the trough. a rotating support above the base, bearing sleeves pivoted to the base to swing radially thereof, shafts journaled in the sleeves, grinding wheels supported by the shafts at their lower ends and cooperating with the rings, the alternate shafts being spaced inwardly to permit the grinding wheels torcooperate with the inner ring and the intermediate shafts being spaced outwardly to permit the grinding wheels to cooperate with the outer ring, yielding means forcing each bearing sleeve toward the adjacent ring, and means for rotating the support.

4:. A machine of the character specified comprising inner and outer grinding rings and means for supporting said rings in spaced coaxial relation, a series of grinding wheels for each ring and 'moving in the space between the rings, means for simultaneously moving the wheels about the axis of the rings, yielding means for pressing each series of wheels toward the adjacent ring, the alternate grinding wheels engaging one ring and the intermediate grinding wheels the other, screens at each ring through which the ground material is delivered, and means for delivering the ground material through the screens.

5. A machine of the character specified comprising inner and outer grinding rings, and means for supporting said rings in spaced coaxial relation, a series of grinding wheels foreach ring and moving in the space between the rings, means for simultaneously moving the wheels about the axis of the rings, ielding means for pressing each series of Wheels toward the adjacent ring, the alternate grinding wheels'engaging one ring and the intermediate grinding wheels the other, and screens at each ring through which the ground material is delivered.

SAMUEL H. HERBST, JR. 

